spam using /msg by a bot

My friends and I were playing but in the chat the message of this image appeared, then he took us all out and when we re-entered someone else joined and the messages appeared again, we expelled that guy and we played again but someone joined with another name and the messages appeared multiple times until they took us out and now they don't let us play in peace, we can't change the realm code and we can't do anything we believe that a bot is doing that for someone bad

 

My friend just told me that when he took us out he said "The server sent a corrupt package"

I come to update the information, now I know that they use something called "script" and they are putting @jugador IP:123.456.789 in the chat. Please help my friends are scared and so am I

[Traduced by google]